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# 来源(Source)：

#include<bits/stdc++.h>
#define ios ios_base::sync_with_stdio(0),cin.tie(0),cout.tie(0)
#define debug  freopen("in.txt","r",stdin),freopen("out.txt","w",stdout);
#define fs first
#define sc second
using namespace std;
typedef long long ll;
typedef pair<int,int> pii;
const int maxn = 1e6+10;
using namespace std;
 
ll T,N,K;
void solve(ll n,ll k){
	if(k%(n-1) == 0) cout<<k/(n-1)*n - 1<<'\n';
	else cout<<k/(n-1)*n + k%(n-1)<<'\n'; 
}
int main(){
	// debug;
	ios;
	cin>>T;
	while(T--){
		cin>>N>>K;
		solve(N,K);
	}
	
	return 0;
}
